Answer:
A rectangle.
Step-by-step explanation:
The 2 ends of the rectangular prism are squares while the other 4 sides are rectangles. A cross section parallel to the base would be a rectangle as the base is a rectangle as well.
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The shape would be a rectangle.
When it says "base", it means the bottom/lowest shape.
The base is a rectangle therefore, the cross section parallel to the base would also be a rectangle.
